django - 如何在启动时可靠地启动多个 DJango FCGI 服务器？

Question

我目前使用以下脚本来启动我的 DJango FCGI 服务器:

#!/bin/bash
MYAPP=$1
PIDFILE=/var/run/${MYAPP}_fcgi.pid
SOCKET=/var/django/${MYAPP}/socket.sock
MANAGESCRIPT=/var/django/${MYAPP}/manage.py
# Maximum requests for a child to service before expiring
#MAXREQ=
# Spawning method - prefork or threaded
#METHOD=
# Maximum number of children to have idle
MAXSPARE=2
# Minimum number of children to have idle
MINSPARE=1
# Maximum number of children to spawn
MAXCHILDREN=3

cd "`dirname $0`"

function failure () {
  STATUS=$?;
  echo; echo "Failed $1 (exit code ${STATUS}).";
  exit ${STATUS};
}

function start_server () {
  $MANAGESCRIPT runfcgi socket=$SOCKET pidfile=$PIDFILE \
    ${MAXREQ:+maxrequests=$MAXREQ} \
    ${METHOD:+method=$METHOD} \
    ${MAXSPARE:+maxspare=$MAXSPARE} \
    ${MINSPARE:+minspare=$MINSPARE} \
    ${MAXCHILDREN:+maxchildren=$MAXCHILDREN} \
    ${DAEMONISE:+damonize=True}
  touch $SOCKET
  chown www-data:www-data $SOCKET
  chmod 755 $SOCKET
}

function stop_server () {
  if [ -f "$PIDFILE" ]
  then
    kill `cat $PIDFILE` || failure "Server was not running."
    rm $PIDFILE
  fi
}

DAEMONISE=$3

case "$2" in
  start)
    echo -n "Starting fcgi: "
    [ -e $PIDFILE ] && { echo "PID file exsts."; exit; }
    start_server || failure "starting fcgi"
    echo "Done."
    ;;
  stop)
    echo -n "Stopping fcgi: "
    [ -e $PIDFILE ] || { echo "No PID file found."; exit; }
    stop_server
    echo "Done."
    ;;
  restart)
    echo -n "Restarting fcgi: "
    [ -e $PIDFILE ] || { echo -n "No PID file found..."; }
    stop_server
    start_server || failure "restarting fcgi"
    echo "Done."
    ;;
  *)
    echo "Usage: $0 {start|stop|restart} [--daemonise]"
    ;;
esac

exit 0

我是这样手动调用的:

/var/django/server.sh mysite start

这工作正常，但是当我的托管公司重新启动我们的服务器时，它给我留下了两个问题:

1. 我没有自动启动多个网站的方法。
2. 我最终得到一个存在但没有关联进程的 mysite_fcgi.pid 文件。

所以我有两个问题:

1. 如何在启动时自动启动站点列表(存储在纯文本文件中)？即调用 /var/django/server.sh mysite1 start 然后调用 /var/django/server.sh myothersite start？
2. 如果进程不存在并尝试正常启动服务器，我如何摆脱 .pid 文件？

Answer 1

1. 创建一个初始化脚本并将其分配给适当的运行级别。
2. 您需要在您的启动/初始化脚本(您将在第 1 步中编写)中实现它

或者，使用流程管理器，如 supervisord这会解决您所有的顾虑。

这是来自 supervisord 的 fcgi 配置示例。

[fcgi-program:fcgiprogramname]
command=/usr/bin/example.fcgi
socket=unix:///var/run/supervisor/%(program_name)s.sock
process_name=%(program_name)s_%(process_num)02d
numprocs=5
priority=999
autostart=true
autorestart=unexpected
startsecs=1
startretries=3
exitcodes=0,2
stopsignal=QUIT
stopwaitsecs=10
user=chrism
redirect_stderr=true
stdout_logfile=/a/path
stdout_logfile_maxbytes=1MB
stdout_logfile_backups=10
stderr_logfile=/a/path
stderr_logfile_maxbytes=1MB
stderr_logfile_backups
environment=A=1,B=2